Try to buy a scrap gold ring from E Bay of the same carat value of your ring prior to travelling, to use as material for the expansion - done that several times over the years to strengthen gold rings ie make the bands thicker - even had two sentimental parents' wedding rings joined up into one thick gold ring.
Turkish jewellery repair shops are brilliant and the one being recommended is fair with pricing and provides a quality service - I have a bracelet that broke in January - it waits for a proper repair in August when I go to
Icmeler again.
England - yes sir, that'll be £100 + 4 weeks wait for the repair!
Not in Turkey - what time can you come back tomorrow, sir ??